The narration referred to Abu Dhar (ra) contradicts with the narration of Ibne Abbas (ra).

In the above narration Ibne Abbas(ra) said that Mutta of Hajj is allowed until the day of Judgment (not only specific for the companions of the Prophet(pbuh) ) this is also Sunnah of the Holy Prophet(pbuh) because the Prophet(pbuh) ordered to do Mutta al-Hajj.